CONTACTLESS ELECTRIC POWER SUPPLY DEVICE

A contactless power supply device includes a power supply core (40), a power receiving core (60), the power supply core (40) and the power receiving core (60) being disposed to face with each other closely, a first conductor (31) being wound annularly to form the power supply coil (30), a second conductor (51) being wound annularly to form the power receiving coil (50), the power supply core (40) including a surface formed with a first annular groove portion (41) for containing the power supply coil (30), the power receiving core (60) including a surface formed with a second annular groove portion (61) for containing the power receiving coil (50), the power supply core (40) being divided at at least a portion in a circumferential direction, and the power receiving core (60) being divided at at least a portion in the circumferential direction.